Manual audit fixes A/E/F: fuel totalizer, Victor/Jet airways, TIME TO BOD

A — Fuel totalizer (SYSTEM key, renamed from ENGINE): DEC/INC/RST FUEL had no
handler. Now adjust the fuel_totalizer_sum_kg dataref (±1 gal, RST→max fuel) and
the EIS shows the calculated remaining/used. cdiSrc-style writable + demo echo.

E — AIRWAYS: was a single on/off. earth_awy.dat field 8 (airway layer) is now
parsed (1=Victor/low, 2=Jet/high; name-prefix fallback), the bbox returns it, and
the AIRWAYS softkey cycles off→all→Victor→Jet with an AIRWY-LO/-HI label.

F — CURRENT VNV PROFILE now shows TIME TO BOD (bottom of descent) once past the
top of descent, instead of only TIME TO TOD.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/bridge.js

@@ -325,6 +325,7 @@ function startDemo() {
     // engine strip (arrays, like the sim)
     engRpm: [2410], fuelFlow: [0.0072], oilTemp: [88], oilPress: [52], egt: [720],
     fuelQty: [60, 58], volts: [process.env.DEMO_ALERT ? 23.4 : 28.0, 27.8], amps: [-1.5], genAmps: [20.5], engHrs: 5040,
+    fuelTot: 118 * 2.72, fuelMax: 144 * 2.72, // fuel totalizer: 118 of 144 gal (kg) — SYSTEM keys adjust
   });
   // a sample plan so the map/FMS show something in demo mode
   fp.setPlan({ name: 'DEMO', waypoints: [